Configuring Option 82 For Ports - TP-Link T1600G-52TS User Manual

Configuring DHCP Service
Step 6
Step 7
The following example shows how to enable DHCP L2 Relay globally and for VLAN 2:
Switch#configure
Switch(config)#ip dhcp l2relay
Switch(config)#ip dhcp l2relay vlan 2
Switch(config)#show ip dhcp l2relay
Global Status: Enable
VLAN ID: 2
Switch(config)#end
Switch#copy running-config startup-config

4.2.2 Configuring Option 82 for Ports

Follow these steps to configure Option 82:
Step 1
Step 2
Step 3
Step 4
end
Return to Privileged EXEC Mode.
copy running-config startup-config
Save the settings in the configuration file.
configure
Enter Global Configuration Mode.
interface { fastEthernet port | range fastEthernet port-list | gigabitEthernet port | range
gigabitEthernet port-list | ten-gigabitEthernet port | range ten-gigabitEthernet port-list }
Enter Interface Configuration Mode.
ip dhcp l2relay information option
Enable the Option 82 feature on the port.
ip dhcp l2relay information strategy { keep | replace | drop }
Specify the operation for the switch to take when receiving DHCP packets that include the
Option 82 field.
keep: The switch keeps the Option 82 field of the packets.
replace: The switch replaces the Option 82 field of the packets with a new one. The switch
presets a default circuit ID and remote ID in TLV (Type, Length, and Value) format. You can
also configure the format to include Value only and customize the Value.
drop: The switch discards the packets that include the Option 82 field.
DHCP L2 Relay Configuration
User Guide 463